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b+c=97
a=12
ab+ac=??


Răspuns :

12b+12c=x
12(b=c)=x
12 x 97 = x
x= 1164
[tex]b+c=97 \\ a=12 \\ ab+ac=a(b+c)=12 \cdot 97=1164 \\ \boxed{ab+ac=1164}[/tex]